222221220210021 has 16 divisors (see below), whose sum is σ = 296511427071936. Its totient is φ = 148039258805376.

The previous prime is 222221220210019. The next prime is 222221220210023. The reversal of 222221220210021 is 120012022122222.

222221220210021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (222221220210019) and next prime (222221220210023).

It is not a de Polignac number, because 222221220210021 - 2¹ = 222221220210019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 222221220210021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222221220210023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72642246 + ... + 75639528.

It is an arithmetic number, because the mean of its divisors is an integer number (18531964191996).

Almost surely, 2^{222221220210021} is an apocalyptic number.

It is an amenable number.

222221220210021 is a deficient number, since it is larger than the sum of its proper divisors (74290206861915).

222221220210021 is a wasteful number, since it uses less digits than its factorization.

222221220210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3015332.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 222221220210021 its reverse (120012022122222), we get a palindrome (342233242332243).

The spelling of 222221220210021 in words is "two hundred twenty-two trillion, two hundred twenty-one billion, two hundred twenty million, two hundred ten thousand, twenty-one".